... narrow to acute point, end reduced originally (5)
I believe the answer is:
taper
'narrow' is the definition.
(thesaurus)
'to acute point end reduced originally' is the wordplay.
'originally' says to take the initial letters.
The initial letters of 'to acute point end reduced' is 'TAPER'.
(Other definitions for taper that I've seen before include "Gradually come to a point" , "Get more slender" , "He records" , "Fall off" , "sticker" .)